In your case I would install Sandboxie again and then try to uninstall it again and try to find the leftovers with a registry cleaner and delete all its folders in the folder Program Files.
Keep in mind that you have to disable Sandboxie completely before uninstalling.

Sandboxie is still in fairly-early-beta status. When messing with betas, EXPECT problems. The best thing is to image your hard drive or use something like FDISR before trying out ANY new software, and especially before trying out a beta.

I don't say this because I am a computer pro, but because of the scars all over my body that happened while I was learning this bit of wisdom.

The problem with learning from experience is -- first you get the final exam, THEN you get the lesson.

In my opinion, if a software uninstaller does not remove over 50 registry entries, and even then has to be uninstalled in safe mode, then it is poorly written.

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That's not its normal behavior. I've been using it for almost two years, and it never did that. You should understand that not every computer's configuration is the same, and on some configurations problems can occurr.

In my opinion, if a software uninstaller does not remove over 50 registry entries, and even then has to be uninstalled in safe mode, then it is poorly written.

Of course, everyone is entitled to their own opinion.

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Hi Silver, TNT is right. Any software can cause problem on some systems/ some time on same system. A poorly written sofware is that which causes problem on many/ most systems.
BTW, it happened to me once. Then I run the installer again and it unisntalled the previous installation cleanly.